http://book.klll.cc/ebooks/subject/40414.opds?sort_order=downloads 2025-08-10T08:05:11Z Books about Astrophysics (sorted by popularity) Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-08-10T08:05:11Z https://book.klll.cc/ebooks/subject/40414.opds?sort_order=title Sort Alphabetically by Title 2025-08-10T08:05:11Z https://book.klll.cc/ebooks/subject/40414.opds?sort_order=release_date Sort by Release Date 2025-08-10T08:05:11Z https://book.klll.cc/ebooks/73996.opds Stellar atmospheres : A contribution to the observational study of high temperature in the reversing layers of stars Cecilia Payne-Gaposchkin 2025-08-10T08:05:11Z https://book.klll.cc/ebooks/75914.opds On the distribution of intensity in stellar absorption lines Harlow Shapley and Cecilia Payne-Gaposchkin